Algae Stains

Welcome to TFP! :wave: If the stains are organic, then usually increasing and maintaining the FC level a little higher, coupled with consistent scrubbing, helps. You can test that theory by carefully rubbing a chlorine tablet around in the area and watching for changes. Do you have a TF-100 or Taylor K-2006C test to share a full set of test results to be sure? FYI - Here at TFP we follow the SLAM Process to ensure algae is killed and removed.
ABCs of Pool Water Chemistry
 
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